Debt (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Preferred stock, shares issued	104,574					104,574
Preferred stock, liquidation preference per share	$ 1,000					$ 1,000
Cash paid in exchange						$ 5.1	$ 27.6
Gain on early extinguishment of debt	$ (0.5)	$ 0.0	$ 0.0	$ 0.0	$ (33.6)	(0.5)	(33.6)
Transaction costs							9.0
Write off of deferred financing cost						0.1	0.4
Long-term debt, current	32.8	6.1				32.8	6.1
Subordination to credit facility, facility total	50.0					50.0
Subordination to credit facility, facility maximum net borrowing	$ 40.0					40.0
Payment in Kind (PIK) Note [Member]
Repurchase of debt						$ 6.3	204.9
Debt instrument interest rate	8.00%					8.00%
Long-term debt, carrying amount		31.3					31.3
Long-term debt, current	$ 26.7					$ 26.7
Senior Notes [Member]
Debt instrument interest rate	8.25%					8.25%
Long-term debt, face amount	$ 74.3	74.3				$ 74.3	74.3
Long-term debt, current	$ 6.1	$ 6.1				$ 6.1	$ 6.1